12139554 has 48 divisors (see below), whose sum is σ = 28531008. Its totient is φ = 3433248.

The previous prime is 12139541. The next prime is 12139559. The reversal of 12139554 is 45593121.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12139559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46027 + ... + 46289.

It is an arithmetic number, because the mean of its divisors is an integer number (594396).

Almost surely, 2^12139554 is an apocalyptic number.

12139554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12139554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14265504).

12139554 is an abundant number, since it is smaller than the sum of its proper divisors (16391454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12139554 is a wasteful number, since it uses less digits than its factorization.

12139554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 432 counting only the distinct ones).

The product of its digits is 5400, while the sum is 30.

The square root of 12139554 is about 3484.1862751581. The cubic root of 12139554 is about 229.8269271378.

The spelling of 12139554 in words is "twelve million, one hundred thirty-nine thousand, five hundred fifty-four".